How to Heat Treat Bimetal

Bimetal is a polar metal that responds to heat by way of bending. The primary use for bimetal is on a home thermostat, because it can determine the ambient temperature of a home or room. If you would like to test the bimetal response for heat, you can do it with a common household item. You don’t have to be an air conditioning technician to heat test your bimetal. You can do it yourself with little hassle.

Hairdryer

Instructions

- 1
  Switch your thermostat to the “On” position, if it isn’t already set.
- 2
  Pull the faceplate off of your thermostat with your fingers. The faceplate should just pop off. This will expose the internal wiring of the thermostat.
- 3
  Locate the small strip of bimetal inside your thermostat. Some bimetals are coiled.
- 4
  Plug in a hairdryer, and turn it to the hottest settings. Aim the hairdryer at your bimetal. Within a few seconds, the air conditioner should turn on as the bimetal responds to the heat inside the thermostat.
- 5
  Replace your thermostat, if the air conditioner does not respond to the bimetal heating.

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